Fix bug when testing multiindex dtypes in assert_frame_equal and assert_series_equal
Merge pull request #8042 from artemyk/fix-assert_frame_equal-multiindex-dtypes

Fix testing multiindex dtypes in assert_frame_equal and assert_series_equal
TST: skip test_kds_colors if too old scipy installed
Fixed incorrect datatype conversion on multi-indexes

Fixed test to use assertTrue

Simplifying tests to write and read back

Simplified multiindex test to use a roundtrip

Release notes update
Merge pull request #8022 from artemyk/sql-create-table-index-dtype-fix

Fixed incorrect datatype conversion on multi-indexes
BUG: fix HDFStore iterator to handle a where properly (GH8014)
Merge pull request #8029 from jreback/hdf_iterator

BUG: fix HDFStore iterator to handle a where properly (GH8014)
API: Timetamp.tz_localize and tz_convert raises TypeError rathar
Merge pull request #8036 from sinhrks/tz_except

API: Timetamp.tz_localize and tz_convert raises TypeError rathar
PERF: StataReader is slow due to excessive lookups for missing vales

Previous versions of StataReader did not correctly check for missing values.
This was fixed in a previous PR, but these checks had previously been
implemented on a value-by-value basis.  This has now been changed to a
vectorized version that is orders of magnitude faster.

Additionally, a benchmark was added to monitor performance issues in the
future.

Closes #8040